fix(network): Adds ConnectUO (#551)

- [X] Adds ability to create new protocol extension packets
- [X] Adds freeshard protocol extension support (packet 0xF1)
- [X] Adds ConnectUO support
- [X] Adds arbitrary read for `CircularBufferReader` and `SpanReader`

Projects/Server/Buffers/SpanReader.cs

@@ -278,5 +278,16 @@ namespace System.Buffers
                 _                  => offset // Begin
             });
         }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public bool Read(Span<byte> bytes)
+        {
+            if (bytes.Length < Length)
+            {
+                throw new ArgumentOutOfRangeException(nameof(bytes));
+            }
+
+            return _buffer.TryCopyTo(bytes);
+        }
     }
 }